1. Department of Chemistry, National Taiwan Normal University, Taipei 106, Taiwan, R.O.C., Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 106, Taiwan, R.O.C., Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan, R.O.C., Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan, R.O.C., and Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 106, Taiwan, R.O.C.